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If a PDF file is protected with an Owner Password, people can read it, but cannot change it. Owner Password is used to protect PDF files from copying, editing and printing. If a PDF file is protected with a User Password, people need to enter the right password to open it.

It is used to protect PDF files from opening. User Password is also named as Open Password. There are two kinds of passwords: User Password and Owner Password. And if you have the correct authorized password, you can even remove PDF Open Password on it as well. It is a professional PDF tool to remove restrictions on copying, editing, and printing PDF files. Powerful PDF Password Unlocker can be used to decrypt password-protected Adobe Acrobat PDF files.